JPH03226530A - Sintering operation method and pallet for sintering - Google Patents

Abstract

PURPOSE:To prevent a sintering progression zone in a lower part and a packed layer from receiving a compressive force by attaching liftable projections to the inner side of pallet side walls for sintering and rising sinter cake by these projections during the course of sintering. CONSTITUTION:The sinter cake lifting projections 14 are attached from the inner side of the pallet side walls 12a for sintering to the upper part of the pallet side walls and the outer side of the pallet and are moved at the same speed as the speed of the pallet 12 by driving rollers 15 with motors 17. The packed layer 5 of the pallet 12 is sintered while the pallet 12 constituted in such a manner is moved. The sintering is progressed up to the front surfaces 14a of the projections in the positions of the rollers 15 to form the cake 18. The projections 14 are successively lifted upward by means of the plural rollers 15a and the sinter cake 18 is successively lifted high up to an ore discharge part 20 at the upper surfaces 14a of the projections when the pallet 12 passes by the rollers 15. The transfer of the compressive force by the weight of the sinter cake 18 to the sintering progression zone 19 and the packed layer 5 is prevented in this way and the air permeability is improved. The sintering speed is thus increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for operating sintered ore, which is a raw material for producing iron in a blast furnace or the like, and a pallet for sintering.

(Prior art) In the method of manufacturing sintered ore from powdered ore, etc., a raw material is produced by blending powdered iron ore with carbonaceous material as a fuel, such as coke powder, and limestone as an auxiliary raw material, and then mixing and granulating the mixture. (
A raw material packed layer (hereinafter referred to as a packed layer) is formed by charging raw material (hereinafter referred to as a raw material) into a sintered pallet. Then, the surface layer of the packed bed is ignited, the coke is burned while drawing air downward, and the raw material is sintered with the combustion heat. In this case, the lower layer of the packed bed is under pressure due to the weight of the integrated sintered mass of the sintered pallet that has been sintered (hereinafter, the integrated sintered mass of the sintered pallet that has been sintered is referred to as a sinter cake). Because it is compressed, it becomes bulky and has poor ventilation. As a result, the amount of air sucked into the packed bed decreases, and the combustion rate of coke decreases, resulting in a decrease in productivity.

Therefore, the present inventors first added more granulated binder to the raw material to be filled in the lower layer of the packed bed than to the raw material to be filled in the upper layer. is referred to as binder segregation addition),
The company filed an application as JP-A-61-170522 for a technology for improving productivity by improving ventilation in the lower layer of the packed bed by strengthening the granulation of the raw material to be filled in the lower layer of the packed bed and making it a coarse-grained raw material.

(Problem to be solved by the invention) The packed bed formed by sintering according to the prior art is compressed under pressure due to the weight of the sinter cake, so the lower the layer, the worse the ventilation becomes, and the amount of air absorbed into the packed bed is reduced. There is a problem that productivity decreases because the combustion rate of coke decreases. Furthermore, the segregation of binder addition has the problem of increasing production costs due to the addition of binder.

The present invention provides an operating method that solves the above problems.

(Means for Solving the Problems) The present invention for solving the second problem is a sintering pallet in which a protrusion that can be raised and lowered is attached to the inside of the side wall of the sintering pallet, and This is a sintering operation method characterized in that, after raw materials are charged into a pallet for sintering, the protrusions are raised in a range up to an ore discharge section.

(Example) Hereinafter, with reference to FIGS. 1 to 5, the features of the present invention will be specifically explained along with the operation using examples.

In the conventional method, as shown in Fig. 6, a hopper 9 is used to supply ore, and a hopper 8 is used to supply auxiliary materials such as limestone.
, a hopper 6 for supplying return ore, and furthermore, coke, which is a fuel, is cut out from the hopper 7, and the humidity is adjusted in a drum mixer 10 and granulated to be used as a raw material. Multiple drum mixers may be used to enhance granulation.

The raw material l is transported to the surge hopper 2, cut out from the tram 3, and charged to the pallet 12 via the chute 4, at a height of 6.
A packed layer 5 of 0.00 mm in thickness was formed and ignited in an ignition furnace 11 for sintering.

As shown in the cross section of FIG. 7, the pallet 12 has a grate 13 on the bottom surface of the pallet, and air is sucked through the openings of the grate 13.

As shown in FIGS. 1, 2, and 3, the uninvented pallet is provided with sinter cake lifting protrusions 14 from the inside of the pallet side wall 12a to the top of the pallet side wall, and from the top of the pallet side wall to the outside of the pallet. did.

The sinter cake lifting protrusion 14 had a structure (not shown) that did not move in the longitudinal direction of the sintering machine but could move 30 mm in the vertical direction. The height of the pallet side wall is 900m
m, and the height of the filling layer 5 is 900 mm, which is the same as the height of the pallet side wall. The pallet width is 500m1.

As shown in FIGS. 1 and 3, the motor connection roller I5 is
The roller shaft I6 is rotated by the power of the motor 17. (The motor 17 is not shown in FIG. 3)
5, it moves by the rotation of the motor-connected roller 15.

Its speed was adjusted to be equal to the speed of pallet 12.

The installation position of the motor connection roller 15 rotated by the motor 17 in FIG. 1 is in the longitudinal direction of the sintering machine as shown in FIG.
It is set as one midway point. Here, the position of the protrusion upper surface 14a of the sinter cake lifting protrusion 14 is 45 On+m, which is 1/2 of 900 mm of the filling layer.

Rollers 15 other than the motor connection roller 15 shown in FIG.
A is not connected to a motor and is simply provided with a roller 15a. The installation position of the roller 15a was set in the range between the installation position of the motor-connected roller I5 and the ore discharge section 20 in the longitudinal direction of the sintering machine, as shown in FIG. The installation interval between the motor-connected roller 15 and the roller 15a is equal to the length of the pallet.
．． It is set at 1.4m, which is slightly shorter than 5m. The vertical heights of the motor-connected roller 15 and the roller 15a are set such that the motor-connected roller 15 is the base point, and the roller 15a is raised sequentially.
The final roller 15-ae, which is closest to the ore discharge section 20 and is about 7 m from the ore discharge section, is set 20 m higher.

Since no rollers are installed from the final roller 15ae to the ore discharge section 20, the sinter cake lifting protrusion 14 is not lifted upward, and therefore the compressive force due to the weight of the sinter cake 18 is applied to the lower part. However, from the final roller 15ae to the ore discharge section 2o, the sintering has finished, so the sinter cake I
The influence of the weight of 8 is small.

In the present invention, unless the sintering progresses to the upper surface 14a of the protrusion and the sinter cake is not formed up to the upper surface 14a of the protrusion, the sinter cake cannot be lifted up by the protrusion 14 and the effect is not achieved. For this reason, the position of the motor-connected roller 15 is determined with a sufficient margin so that the sintering always progresses to the upper surface 14a of the protrusion.

The progress of sintering was ascertained by measuring the temperature inside the packed bed in advance.

FIG. 5 shows the state in progress of sintering of a packed bed formed in a process similar to the conventional method shown in FIG. 6 using a pallet equipped with sinter cake lifting protrusions 14.

In FIG. 5, the sintering of the filled layer progresses, and the upper surface of the protrusion 1
The sinter cake 18 sintered to the position 4a is first supported by the motor-connected roller 15 via the special object upper surface +4a on the upper surfaces 14a of the sinter cake lifting projections 14 on both sides of the pallet. Further, from the motor-connected roller 15 at the midpoint in the longitudinal direction of the sintering machine to the final roller 15 on the ore discharge side.
The vertical height of a is gradually increased, and the final roller 15a on the ore discharge side
20 mm higher, the sinter cake 18 can be lifted up a little C from the midpoint where the motor connection roller 15 is installed. Therefore, the compressive force due to the weight of the sinter cake 18 is not transmitted, so that the bulk density of the sintering progress zone 19 and the packed bed 5 does not increase, improving ventilation and increasing the sintering rate.

In addition, although the conventional method could only sinter a layer thickness of 600 m5, the present invention enables sintering even with a packed layer as thick as 900 m5, and the yield improvement effect due to the high thickness can also be enjoyed.

The amount of sinter cake lifted in this example is 20
+vn, but it is not limited to 20 sushi and 1 piece, and it is sufficient that the weight of the sinter cake is not transmitted to the lower sintering progress zone and the packed bed, and it can be less than 201 or more. Further, although the non-tar cake lifting amount in this embodiment is 2011II continuously, it does not necessarily have to be continuous, and may be carried out in stages.

Furthermore, although the sinter cake lifting start time in this embodiment is set at the midpoint in the longitudinal direction of the sintering machine, it is not necessarily limited to the midpoint, but may be earlier or later than the midpoint.

(Effects of the Invention) As explained above, according to the sintering method and sintering pallet of the present invention, the compressive force of the sinter cake is not transmitted to the sintering progress zone and the packed bed in the lower part, so the lower part of the packed bed has a high bulk. Therefore, the sintering speed of the lower layer increases without increasing the density, and the yield rate improves by increasing the thickness of the upper layer, making it possible to perform highly productive sintering.

According to the present invention, the productivity is 37.8 t/D/m'', which is about 5 t/D/m' compared to 32.1 t/D/m' in the conventional method.
It is now possible to sinter materials with a high productivity of more than 500 m.

[Brief explanation of drawings]

Figures 1, 2, 3, 4, and 5 are diagrams showing embodiments of the present invention, Figure 6 is a diagram showing a sintering process according to a conventional method, and Figure 7 is a diagram showing a sintering process according to a conventional method. It is a figure showing a pallet. ■... Raw material 2... Surge hopper 3... Drum feeder 4... Noyute 5... Filled bed 6... Return hopper 7... Coke hopper 8... Limestone hopper 9... Ore hopper lO... Drum mixer 11... Ignition furnace 12... ...Pallet 13...Grate 14...Nontar cake lifting protrusion +4a.
...Top surface of protrusion 15...Motor connection roller 15a...Roller 15ae...Final roller 16...Roller shaft 17...Motor 18...Sinter Cake 19...Sintering progress zone 20...Ore discharge department No. 1g2 Figure 1B3 section @5wA 18 No. 655

Claims (1)

[Claims] 1) A protrusion that can be raised and lowered is attached to the inside of the side wall of the sintering pallet, and after loading raw materials into the sintering pallet, when sintering, the protrusion is moved up to the ore discharge part. A sintering operation method characterized by increasing the temperature within a range of . 2) A sintering pallet characterized in that a protrusion that can be raised and lowered is attached to the inside of the side wall of the sintering pallet.